Ratio

• ratio highest level of measurement. The higher the level, the more complex the measurement is.
• At the ratio level, values can be categorized, ordered, have equal intervals and take on a true zero.
• ratio data takes on number values, from which we can tell exactly how much bigger one value is than another.
• Hair length quantitative as can be described with numbers. We can tell exactly how much bigger one number is than another, for instance 20 cm-long hair is twice as long as 10 cm-long hair, so this must be ratio data.
• the value of ratio data can't go below zero as it can't take on negative values. e.g. impossible to have a height of -130cm or mass of -30kg